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KVM: PPC: Resolve real-mode handlers through function exports

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Up until now, Book3S KVM had variables stored in the kernel that a kernel module
or the kvm code in the kernel could read from to figure out where some real mode
helper functions are located.

This is all unnecessary. The high bits of the EA get ignore in real mode, so we
can just use the pointer as is. Also, it's a lot easier on relocations when we
use the normal way of resolving the address to a function, instead of jumping
through hoops.

This patch fixes compilation with CONFIG_RELOCATABLE=y.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf
2011-06-07 20:45:34 +02:00
committed by Avi Kivity
parent 24294b9a3f
commit a22a2daccf
4 changed files with 6 additions and 14 deletions
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4
arch/powerpc/kvm/book3s.c
View File

@@ -1342,8 +1342,8 @@ struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
vcpu_book3s->slb_nr = 64;
/* remember where some real-mode handlers are */
vcpu->arch.trampoline_lowmem = kvmppc_trampoline_lowmem;
vcpu->arch.trampoline_enter = kvmppc_trampoline_enter;
vcpu->arch.trampoline_lowmem = (ulong)kvmppc_handler_lowmem_trampoline;
vcpu->arch.trampoline_enter = (ulong)kvmppc_handler_trampoline_enter;
vcpu->arch.highmem_handler = (ulong)kvmppc_handler_highmem;
#ifdef CONFIG_PPC_BOOK3S_64
vcpu->arch.rmcall = *(ulong*)kvmppc_rmcall;

4
arch/powerpc/kvm/book3s_exports.c
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@@ -20,8 +20,8 @@
#include <linux/module.h>
#include <asm/kvm_book3s.h>
EXPORT_SYMBOL_GPL(kvmppc_trampoline_enter);
EXPORT_SYMBOL_GPL(kvmppc_trampoline_lowmem);
EXPORT_SYMBOL_GPL(kvmppc_handler_trampoline_enter);
EXPORT_SYMBOL_GPL(kvmppc_handler_lowmem_trampoline);
EXPORT_SYMBOL_GPL(kvmppc_rmcall);
EXPORT_SYMBOL_GPL(kvmppc_load_up_fpu);
#ifdef CONFIG_ALTIVEC

8
arch/powerpc/kvm/book3s_rmhandlers.S
View File

@@ -251,12 +251,4 @@ define_load_up(altivec)
define_load_up(vsx)
#endif
.global kvmppc_trampoline_lowmem
kvmppc_trampoline_lowmem:
PPC_LONG kvmppc_handler_lowmem_trampoline - CONFIG_KERNEL_START
.global kvmppc_trampoline_enter
kvmppc_trampoline_enter:
PPC_LONG kvmppc_handler_trampoline_enter - CONFIG_KERNEL_START
#include "book3s_segment.S"